New ring-opening reaction of thiiranes with carboxylicacid derivatives having good leaving groups was investigated. The reaction of thiiranes with acyl chlorides or S-aryl thioesters using quaternary onium salts as neutral catalysts proceeded very smoothly and regioselectively to afford the corresponding S-thioesters as addition products.
A green protocol for rapid and efficient conversion of epoxides to thiiranes using alumina immobilized thiourea at solvent-free conditions
作者:Ronak Eisavi、Behzad Zeynizadeh
DOI:10.1080/10426507.2015.1085044
日期:2016.1.2
GRAPHICAL ABSTRACT ABSTRACT Solvent-free conversion of various epoxides to the corresponding thiiranes was carried out successfully with alumina-immobilized thiourea at room temperature. The reactions were completed within 2–9 min to give thiiranes with 83–98% yields. The utilized alumina can be reused for several times without losing its activity.
A Convenient Synthesis of Thiirans by the Use of Dimethylthioformamide
作者:Toshio Takido、Yoshio Kobayashi、Kunio Itabashi
DOI:10.1055/s-1986-31778
日期:——
Dimethylthioformamide (DMTF) reacts with oxirans in the presence of a catalytic amount of trifluoroacetic acid under mild condition to form the corresponding thiirans in good yield.
Magnetically separable nano CuFe<sub>2</sub>O<sub>4</sub>: an efficient and reusable heterogeneous catalyst for the green synthesis of thiiranes from epoxides with thiourea
作者:Ronak Eisavi、Seiran Ghadernejad、Behzad Zeynizadeh、Farkhondeh Mohammad Aminzadeh
DOI:10.1080/17415993.2016.1196691
日期:2016.9.2
ABSTRACT The magnetically separable nano CuFe2O4 was prepared and used as an efficientheterogeneouscatalyst for conversion of various epoxides to the corresponding thiiranes with thiourea in refluxing ethanol. The reactions were completed within 34−45 min to give thiiranes in 80−95% yields. The utilized nano CuFe2O4 can be reused for several times without losing its activity. GRAPHICAL ABSTRACT
Green synthesis of thiiranes from epoxides catalyzed by magnetically separable CuFe<sub>2</sub>O<sub>4</sub>/Mg(OH)<sub>2</sub>nanocomposite in water under benign conditions
The magnetically separable CuFe2O4/Mg(OH)2 nanocomposite was prepared and characterized by FT-IR, XRD, SEM, EDS, and VSM techniques. The synthesized nanoparticles were used as a new and efficient heterogeneous catalyst for the conversion of various epoxides to the corresponding thiiranes with thiourea in water solvent at room temperature. The reactions were completed within 1–3.7 h to give thiiranes